Hi,
I can't find any pre made actions for this. If there is then can someone point it?
Meanwhile, I scripted one. You can get the code here
http://hutonggames.com/playmakerforum/index.php?topic=113.01: In your project Panel, open Playmaker/Actions/
2: Create a new c# script
3: Rename it ApplicationQuit
4: copy the code from the link above
5: select your button fsm
6: Select the State that needs to quit the app
7: browse the actions under the GameLogic tab and select ApplicationQuit and add it to your State
8: now if you run, and reach that State, it will quit the application.
If you have any questions, do not hesitate:)
Bye,
Jean